Create Secure Web Service in IIS 6.0, Asp.net 2.0

Hello,
   I need to create a secure web service on a server using IIS 6.0 and ASP.NET 2.0. I have Visual Studio 2008.  I can create a file that is a Web Service file, and can define the interfaces for the client. What I don't know how to do is to authenticate the clients who invoke the interface.  The website itself is secure (i.e. starts with https://)   I don't know what I need to do to authenticate the client.  (Keep the IIS 6.0 and ASP.Net 2.0 restrictions in mind).  Can someone please advise me on how to do this?

Thanks
tigriswoodsAsked:
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tigriswoodsAuthor Commented:
Sorry for my delayed response.  I thought I had the web service done, but I didn't realize I really cannot use WCF to deploy the service on Asp.Net 2.0.  Now that I understand that, I might still need the answer to this question, so I will leave it open for the time being while I redo the web service.
tigriswoodsAuthor Commented:
Thank you. I understand now!
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Microsoft IIS Web Server

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